The Extech HD300-NIST CFM/CMM Thermo-Anemometer with Built-In InfraRed Thermometer measures non-contact surface temperature to 932°F (500°C) with 30:1 distance to target ratio and Laser pointer. It can simultaneously display Air Flow in CFM/CMM or Air Velocity Plus Ambient Temperature. The HD300 has easy to set Area dimensions that are stored in the meters internal memory for the next power on. Additional features include: large (9999 count) LCD backlit display, 20-point average for airflow, and a heavy duty rugged double molded housing. With NIST Calibration.